Are you also thinking that some cards are 'top sheet only' cards and others are 'bottom only'? (for instance, the ones showing remnants of the factory number at the bottom of the sheet?)

Great little project!

That's what I'm thinking.

Although I'd expect to see more with two different names if that was the case. And that's why I'm not entirely set on 4 being the number of instances of the same player.

But from looking at the rare cards, 4 looks pretty solid. I'm sure there are 3-4 Magies that can be told apart even from scans that aren't great. And that each diferent Magie front matches to a specific back.